In a message dated 9/25/2005 4:58:40 PM Eastern Daylight Time, 
[EMAIL PROTECTED] writes:

> Only selection determines that those with high net reproduction rates
> each generation reproduce so that what was improbable becomes
> probable.
> 

It seems to me that a good way to think about this is "How many grandchildren 
are produced" which allows for not only the number of offspring are produced 
but also the reproductive success of the children. After all it does no good 
to produce lots of offspring if they are all killed before they can reprodcue
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